Core-molding mechanism



Nov. 4, 1930. R. E. DUNHAM 1,780,470

CORE MOLDING MECHANISM Filed Jan. 28, 1929 4 sheets-sheet 1 Pig. 5

KQS I* Dssssg? Attornergs Nov. 4, 1930. I RqE. DUNHAM CORE MOLDING MECHANISM Filed Jan. 28, 1929 4 Sheets-Sheet 2 Ra E'. Duggan; Inventor .Aitofrle I* Nov. 4, 1930r R. E. DUNHAM CORE MO'LDING MECHANISM Filed Jan. 28, 1929 4 Sheets-Sheet Rag BJ. DcnleDn-tof 1( Aitor-nega Nov. 4, 1930. R. E; DUNHAM 1,780,470

' CORE MOLDING' MECHANISM Filed Jan. 28, 1929 4 sheets-sheet 4 SHIEIII' TF Kaj E'. Duxjlgang Inventor Atto-ruega Patented Nov. 4, 1930 UNITED STATES PATENT oFFIcE- RAY E. DUNHAM, OF BEREA, OHIO7 ASSIGNOR TO THE DUNHAM COMPANY, 0F BERETA,

' OHIO, A CORPORATION OF OHIO GORE-IVJIOILLIBIG MECHANISM vApplication led ITanuary 28, 1929.- Serial No.. 335,445.

My invention relates to core molding mech'- anism, and t-he principal object of my invention is to provide new and improved mechanism of'this type. In the drawings accompanying this specification and forming a part of this application I have shown, for pur.- poses of illustration, one form which my invention may assume, and in these drawings:

Figure 1 is a side elevation of the embodiment of, my invention hereinillustrated;

Figure 2 is a front elevation'of the device shown in Figure 1;

Figure 3 is a rear elevation of shown in Figures 1 and 2;

Figure 4 is a top planview of the embodiment of my invention herein illustrated;

Figure 5 is a section on the line 5-5 of Figure 1; i

Figure 6 is a section on the line 6 6 of Figure 1;

Figure 7 is a view similar to Figure 4 but showing the cope section swung over into sand receiving position Figure 8 is a viewsimilar to Figure 7 but showing the core forming inserts advanced and the core spider in place; i

Figures 9 through 11 are views similar ref Spectively to Figures 1, 2, and 7 but showing the cope section swungtinto sand receiving position and the core supporting frame in position; whilev Figure 12 is a detail illustrating the connection by which the core supporting Aframe is attached tothe core spider.Y i

The embodiment ofmyinven" onherein shown comprises a-frame'll' pro Y ed with a base 12 supported for-moveine rom place to place by means 'of eels 13 and carrying an annular-u? tion 14 terminatingi f porting for vertlca r' ocation relative thereto a table 16 termina" ng in a face plate 17 having-its upper face substantially flush with the upperfaceofthe face plate of the frame :11 when the table 16 is in elevated posthe device tion. In the embodiment of,v my invention herein shown the table 16 is reciprocably mounted in the annular section 14 of the frame 11 by means of four V-ribs 18 .projecting from the table 16 adjacent the corners thereof and riding in corresponding' V`- grooves 19 formed in runners 2O adjustably secured to bars 2l forming parts of the anynular section 14 ofy the frame 11 lby means of machine screws 22 adjustable to bring the ,V-grooves 19 inthe runners 20 i-toregistraftion with the `Vribs 18 on the ta 6.

In the embodiment of my inventi xgiY herein i shown the weight of the table 16,-'and t-he weight of the parts carried thereby, is almost counter-balanced by meansv of a pair of springs 23 extending betweenthe lower face of the table 16 andthe upperl face of the base 12 of the frame 11 surrounding rods 24 which extend downwardly from the lower face of the table 16 through cooperating apertures 25 formed in bosses 26 lpresent on the endsof -the base 12 of the frame llland are effective to additionally guide the :table 16 relative to the frame 11, and the table 16 is reciprocated relative to the frame 11 by means of Vfour links 27 pivoted at their .upper ends to the four corners of the table 16and at their lower end to lbell-crank 'levers 28 mounted upon shafts 29 and 30 supported inthe frame 11 having their lower arms connected by means of links 31, andoperated in unison because of the interconnection.through the links 31 and by rotation. of the shaft 29 `by means of a suitable ,operating lever 3,2 sei-v oured thereto.

Projecting` fromL the upper face of4 the table 16 are a pair ofiposts` 3 3 to which are pivotally connected arms A34 secured yto .the

drag-section 35 and thereforesupporting the.

drag section for pivotal movement `abouttlna pivot pins 36 uniting the hubs ofthezposts 33and arms 34, while rising fromthevfae plate 15 ofthe frame :11 are a` pairofposts 37 towhicharepivoteda pairof arms j38- i connected to the cope section 39 to support the cope section 39 tor pivotal movement about the pivot pins 40 connecting the hubs of the posts 37 and arms 38 and alined with the drag section pivot pins 36 when the table 16 is in its fully elevated position relative to the frame 11.

In the particular embodiment or my invention it is desired that the core contain indentations which cannot be 'formed directly by the drag and cope sections 35 and 39 without preventing stripping oi the core, and accordingly must be formed by removable or retractable elements m vable relative to the drag and cope sections and 39, and accordingly in the embodiment of my invention herein shown the cope section 39 contains four retractable elements 41 movable between advanced and retracted position by means of four levers 42 pivoted at their outer ends to the :tour retractable elements 41 and formed at their inner end as eccentric straps surrounding eccentrics 43 fixed to a sha-tt 44 mounted in ribs 45 on the outer face of the cope section 39 and operated by means of a handle 46r effective as will readily be understood to simultaneously move all ot the elements 41 between advanced and retracted position, and the drag section 35 is provided with similar elements 47 similarly operated. The embodiment of my invention herein shown also contemplates the use in the core, in thedrag section of the core, of a core vspiderv 48, and accordingly the drag section 35 is provided with recesses 49 for the reception-of the core spider 48.

In voperation the cope and drag sections are opened to the position shown in Figures 7 and 8, kthe elements 47 and 41 are advanced into the position 'shown in Figure 8, the core spider 48 is inserted-into position asV shown in Figure 8, and the sand isv rammed into both Vthe cope section 39 and the drag section 35, then both the drag section 35 and the cope section 39 are swung about the pivot pins 36 and 40 intovertical hooking` position abutting each other, after which the cope section 39 and the drag section 35 are together swung further about the pivot pins 36 and 40 until the drag section 35 has returned to its original position and the cope section 39 is positioned inverted atop the drag section 35, as shown in Figures l through 4. The elements 41 of the cope section 39 are then retracted, and then thetable 16 and the drag section 35 are depressed to strip the core from the cope section 39, the cope section 39 being held against further downward movement by the engagement of its tree edge with pins 50 rising from the ace plate 15 of the trame l1, and the cope section 39 being thereafter swung back into its Vinitial sand receiving position ready for the reception of Vsand for the next core. The t-able 16, the drag section 35, the core spider 48, and the core surrounding the core spider 48, are then returned to elevated position, after which a core supporting frame 51L is placed in position resting at one side upon the cope section pivot posts and arms 37 and 38 and at the other side upon thepins 5 52 projecting therefrom, into position within the mold. `for which the core has been prepared.

ln the embodiment of my invention herein shown the core supporting frame Y 51 is quickly detachably connected to the core lspider 48 by means of a pair of pins 53 positioned in apertures 54 extending vertically through the two sidesoi' the core supporting frame 51, normally held, in elevated position by means of springs 55 compressed between annular shoulders 56 extending inwardly in the apertures 54 adjacent the lower ends thereof and collars 57 secured to the pins 53 in position to overlie the topsof the bores 34, and provided at their lower ends with cross pins 58 adapted to enter through slots 59 in the corresponding arms 60 of the core spider 48 into circular recesses 6l with which the slots 59 communicate,and to then be rotated, by rotation of the handles 62 connected to the upper ends'ot the pins 53, into position underlying the top walls of the circular recesses 61 laterally of the slots 59 the collars 57 serving then to support the pins 53 from the core supporting frame 51; and the core supporting frame 51 is registered with the core by means of pins 63 projecting upwardly from the drag section 35 in position to engage within forks 64 projecting from the ends of the core supporting frame 51 and operable later to register the core supporting :trarne 51 and the core carried thereby with the moldinto which the core is being positioned.

lith the embodiment of my invention herein 'shown I am able to make the core entirelyof green sand, and to make and strip the core on asingle machine, and by means Vof acore supportsuitable for transporting the core to the mold to which it is to be inserted, and accordingly it will ybe apparent that the embodiment of myfinvention herein shown and described accomplishes at least the principal object of my invention. At the same time it'will also be understood by those skilled in the art that the particular embodiment of my invention herein shownl embodies advantages `other than thosey particularly pointed out or suggested herein,

ill)

and also that this particular embodiment of my invention may be variously changed and modified Without sacrificing the advantages thereof or departing from the spirit of my invention, and it therefore Will be understood that the disclosure herein kis illustrative only and that my invention is not limited thereto.

l claim:

l. Core molding mechanism, comprising: a frame; a table; means for effecting substaiitially vertical reciprocation of said table relative to said frame; a drag section and a cope section mounted respectively on said table and on said frame and movable relative to each other into and Yout of cooperating position; and means, becoming operable as said sections are moved ont of cooperating position, for supporting the core independently of said drag section.

2. Core molding mechanism, comprising: a frame; a table; means for effecting substantially vertical reciprocation of said tablerelative to said frame; a drag section mounted on said table; a `cope section mounted on said frame and movable into and out of position cooperating with said drag section; and means, becoming operable as said cope and drag sections are moved out of cooperating position, for supporting the core independently of said drag section.

3. Core molding mechanism, comprising: a frame; a table; means for effecting substantiall).7 vertical reciprocation of said table relative to said frame; a drag section mounted on said table; a cope section pivoted on said frame and oscillatable into and out of position cooperating' with said drag section; and means, becoming operable `as said cope and drag sections are moved out of cooperating position, for supporting the core independently of said drag section.

4. Core molding mechanism, comprising: a frame; a table; means for eifecting substantially vertical reciprocation of said table relative to said frame; a drag section and a cope section mounted respectively on said table and on said frame and movable relative to each other into and out of cooperating position: and means, becoming operable as said sections are moved out of cooperating position, for supporting the core independently of said drag section, and operable also for transporting said core from said core molding mechanism to the mold.

5. Core molding mechanism, comprising: a fra-me; a table; means for effecting substantially vertical reciprocation of said table; a drag section and a cope section mounted respectively on said table and on said fra-me and movable relative to each other and said table into and out of cooperating position; and

Y means, becoming operable as said sections are moved out of cooperating position, for supporting the core independently of said drag section.

6; Core molding mechanism, comprising:

` tion; and a cope section pivoted to said'frame on an axis alined with the pivotal axis of said drag 'section in one relative reciprocatory position of said table and'said frame', and movu able from sand receiving position opened from said drag section through .said booking position to inverted position atop saiddrag section.

7. Core molding mechanism, comprising:

a frame; a table; means for effecting substantially vertical reciprocation of said table relative to said frame; a drag section pivoted to said table movable to substantially vertical booking position; and a cope section pivoted to said frame on an axis alined With the pivotal axis of said drag section in one relative reciprocatory position of said table and said.

frame, and movable from substantially horizontal sand receiving `position opened from said drag section through said substantially vertical booking position to inverted position atop said drag section.

8. Core moldingr mechanism, comprising: a frame; a table; means :for effecting substantially vertical reciprocation of said table; a drag section pivoted to `saidtable movable to booking position; and a cope section pivoted to said frame on an a-Xis alined Withthe pivotal axis of said drag section in one relative recipro'catory position of said table and `said frame,and movable from sand receiving position opened from said drag section through said booking position to inverted position atop said drag section. i

9. Core molding mechanism, comprising: a frame; a table; means for effecting substantially vertical reciprocation of said table relative to said frame.; a drag section pivoted to said table movable to booking position; a cope section pivoted tosaid frame on an axis alined'with the pivotal axis of said drag section in one relative reciprocatory position of said' table and said frame, and movable from sand receiving position opened from said. drag section through said booking position to inverted cooperatingV position atop said drag section; and means, becoming operable as said cope'and drag sections are moved out of cooperating position, for supporting `the core independently of said drag section.

l0. Core molding mechanism, comprising: a frame; a table; means for effecting substantially vertical reciprocation of said table relative to said frame; a drag section pivoted to said table movable tosubstantially vertical booking position; a cope section pivoted to said frame on an axis alined with the pivotal axis of said drag section in one relative reciprooatory position of sa-idtable and said frame, and movable from substantially horizontal .sand receiving position opened from said drag section through said substantially Vertical booking position to inverted cooperating position atop sind drag section; and

vmeans, becoming operable as said cope and drag sections are moved out of cooperating positioin for supporting the core independently'o' said drag section.

In testimony whereof I signature.

hereunto affix my RAY E. DUNHAM. 

